DS1307 Real Time Clock Breakout Board Kit . This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC, and works best with 5V-based chips such as the Arduino.
This breakout board is a kit and requires some light soldering which should only take about 15 minutes.
Please note: The DS1307 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day.
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